Create Areas By Extrusion

Keyboard shortcut: X (expert mode only) — is one of the working modes

Combination of parallel way segment movement and angle preserving drawing mode.

Extruder has two different behaviors toggled by the keyboard shortcut X or through the Edit menu.
Depending on the object type (node, way, closed way) and the pressed modifier key, extruder offers different modes.

Move a node along adjacent segment (Ctrl)

Special case when a node selected, press Ctrl to activate mode. This mode doesn't create any new nodes or ways.

Will move a node in every of two directions. Resulting point can be moved in one of (2*adjacent segments) directions:

Move segment in parallel (Ctrl)

Move segment in parallel. Nodes are moved even if they are connected to other ways.

This mode doesn't create any new nodes or ways.

Basic extrude usage on closed ways

Here, DrawBuilding was used to create approximations first, then multiple Extrude tools were used, which are explained later:

Special case with two nodes

If you start with just a single line segment, you will get a rectangle.

On closed ways

Click on a way segment and drag it. There are up to 3 possible directions - at right angle to the original position and along its neighboring segments. The chosen reference segment will be indicated.

Note: In certain cases new nodes will not be created. Specifically, if new segment is just lengthening of the old one. However, the node will not be moved when it's part of another way, as to not affect the other way.

Double click will insert a node

A double click at a way segment inserts a new node.

Modifiers

Dual alignment (X)

Toggled by X or the item in the Edit menu. Instead of using one reference segment and moving both nodes of the selected original segment in the same direction, this mode uses two reference segments (neighbors of the original segment) and moves the nodes each according to its own reference segment.

The status is indicated in the status line and visually (two reference segments shown instead of one).

Create intermediate points (Shift)

Always create nodes, even if new segment is just lengthening of the old one.

Create a new way nearby (Alt)

Don't alter original way, create new way instead. Ways will share the two nodes.

Extrude usage on unclosed ways

Drag end node with (Ctrl)

Will extend way (move a node along segment):

Advanced Preferences

• Color of main line: Defaults to selected color, but can be changed with advanced preference color.extrude.main.line.
• Stroke of main line: extrude.stroke.main. Parameters: <width> for solid line (width in pixels), <width> <dashlength> <spacelength> for dashed line.
• Stroke of old line (used while moving segment): extrude.ctrl.stroke.old-line (stroke parameters).
• Color of helper line: Extrude: helper line in colors settings.
• Stroke of helper line: extrude.stroke.helper-line (stroke parameters).
• Size of right angle helper symbol: extrude.angle-symbol-radius (pixels).
• Moving nodes without the need of pressing Ctrl: extrude.drag-nodes-without-ctrl (boolean).
• Ignoring shared nodes to avoid overlapping segments: extrude.ignore-shared-nodes (boolean).
  • If enabled (default), nodes shared with other way(s) are left untouched and new node is created to facilitate the extrusion.
    
  • If disabled, shared nodes are still part of the way, segments might overlap
    
• The extrude action will be performed only if the pointer moved more than specified distance: extrude.initial-move-threshold (pixels, default 1).
• Changing the keyboard shortcut of Dual alignment mode: Set extrude.dualalign.toggleOnRepeatedX to false to disable the default one, set new one via Mode: Extrude Dual alignment shortcut.

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